The purpose of this study was to assess a variety of measures relating to adolescent risks and adult outcomes among subjects categorized into one of a variety of longitudinal marijuana use trajectories. Subjects were 1200 adolescents tested at age 12, 15 or 18 in 1979-81 and returned 3, 6 and 13 years later. It was found that 78% of the sample had used marijuana at some time. Using growth curve analysis and measures of quantity, frequency, intensity of intoxications and consequences of use, 12 longitudinal patterns of marijuana use among non-abstainers were found. Four of these groups embodied 46% of the sample and reflected 1) low level consumption/problems at age 15 with cessation by age 21, 2) peak levels of consumption from 18-21 with limited problems and cessation by 24, 3) high levels of consumption and problems from 15-25 with cessation by 28 and 4) sustained high levels of consumption and problems from 15-31. The remaining eight groups reflect meaningful subgroups of those mentioned above.
Results of group comparisons indicated that subjects who used from age 15-31, reported the highest levels of negative life events and lifetime alcohol use. Arousal needs were found to be highest among the groups who used until late adulthood. Life satisfactions were not differentiated by use trajectory, however, abstainers reported significantly higher satisfaction levels than any of the user groups.
We conclude that there are identifiable risk factors associated with the variety of marijuana use trajectories and these patterns are critical determinants of adult outcomes.
Learning Objectives: At the conclusion of the session, the learner will be able to identify the major risk and protective factors in determining the variety of marijuana use patterns in a middle class community sample. In addition, the learner will be able to identify differences in adult outcomes based upon lifetime patterns of use. During this session, I will discuss recent research regarding the marijuana use among a community sample of subjects followed over a 20 year period. I will discuss the development of use trajectories and examine the complexity of lifetime patterns of use.
Keywords: Adolescents, Marijuana
Presenting author's disclosure statement:
Organization/institution whose products or services will be discussed: None
Disclosure not received
Relationship: Not Received.